sma - r smart wristbands heart rate monitor smart watch dual bluetooth wristband smart watches b

main features: - heart rate monitoring: it can test and record your heart rate result, you can ensure whether suitable to continue to take exercise - siri voice control: no need to operate it by hand, only by voice command when driving or doing other things, convenient to use - sleeping monitoring, sedentary reminder, activity track, music control, etc. - supporting multiple information pushing: g-mail, e-mail, facebook, twitter - lift your wrist, bright the screen